Poster board



March 28, 1959 BOYER 2,501,719

' POSTER BOARD Fil ed Sept. 27, 1946 INVENTOR. HOWARD B. BOYER ATTOR'NEY Patented Mar. 28, 1950 UNITED STATES PATENT OFFICE 3 Claims.

This invention relates to improvements in poster boards and is particularly adapted to be used in connection with the posting of records, bills, statements and the like.

The primary object of the invention is the provision of a clamping device that will have a quick release permitting the insertion of additional material under the same with a minimum amount of efiort.

Another object of the invention is the provision of a clamping device that will securely hold the postings after the clamp has been applied.

A further object of the invention is the applying of a gripping action completely against the surface of the postings preventing them from shifting their position relative to the board.

A still further object of the invention is the eliminating of having to punch holes through the records being posted, which adapts the same more readily to carbon copies.

And another object is the provision of means within the clamp for increasing the depth of the postings from time to time without removing the objects being osted.

These and other incidental objects will be apparent in the drawings, specification and claims.

Referring to the drawings:

Figure l is a plan view of my new and improved poster board showing the posted material being clamped thereon.

Figure 2 is an end sectional view taken on line 2-2 of Figure 1, parts broken away for convenience of illustration and particularly illustrating the structure of the clamping device.

Figure 3 is a fragmentary sectional enlarged detail taken on line 3-3 of Figure 2, the postings being indicated by a broken line.

Figure 4 is an enlarged fragmentary view taken on line 4-4 of Figure 2 illustrating the method of operating the clamping assembly.

Figure 5 is a fragmentary sectional detail taken on line 5-5 of Figure 2.

In the drawings:

My new and improved poster board consists of a board I having a clamping assembly mounted thereon generally indicated by numeral 2. The

clamping assembly consists of upright posts 3 sesions III, these extensions are slotted as at II as viewed in Figure 4 through this slot and trans- 2 versely of the board is an operating rod I2, which is supported upon springs I3 resting in the cored out portion I4 of the extensions I0. This operating rod is maintained against the springs I3 by v the adjusting screws I5 and springs I5, which have a knurled head I6 for operating the same. The object and purpose of which will be described later on.

A holding down clamp I1, having slots I8 formed on its ends and passing over the extensions I D is operated by the operating rod I2 in the following manner. Located adjacent the ends of the operating'rod I2 are cranks I9 and I9, which are connected to the clamping bar I! by the links 20 journalled to the cranks at their upper ends and to the stationary bearings 21- at their lower ends.

I will now describe the operation of my new and improved poster board. The materials being posted are indicated at Z I. When it is desired to post additional material the levers 25 forming part of the operating rod I2 are revolved to the broken line position in Figure 2. This will raise the clamping bar I! to the broken line position. The clamping bar H has an initial curve formed in the same so that the central portion midway its end will contact the posted material as indicated by the broken lines. This will cause the bar to grip the posted material from the center out to its ends when forced downward against the material. This curve should only be of a sufiicient amount to accomplish this object.

When the levers 25 were rotated to the dotted position they raised the clamping bar as above described sufficient to clear the same above the surface of the posted materials 24, allowing sufficient space for inserting additional material to be posted without interference. When the material has been inserted the levers 25 are revolved to the position shown in Figures 1, 2 and 4, which forces the clamp I'I down against the materials 24, but in doing so the cranks I9 and I S'pass their center line as best illustrated in Figure 3.

Formed on the lower ends of the links 20 are feet 22 which contact the upper surface of the clamp preventing further movement of the links 20 after passing their center line, thereby maintaining the bar against the posted material 24 until the cranks 25 are again operated pulling the links 20 back past their center line and raising them, together with the bar, as illustrated in Figure 5. As the posted materials build up under the clamping bar, the adjusting screws I6 are backed off from the springs I5 allowing the operating rod I2 to raise within the slots II providing for a fine and accurate adjustment. When these screws have been backed off their full travel it then becomes necessary to add additional extension posts 3 providing for a coarse adjustment of the clamping unit. In the beginning the extensions It will be directly secured to the board eliminating the posts 3 until the material has increased in depth where these extensions will be required.

Corrugations 28 are formedalong the edge of the clamp 11 best illustrated in- Figure 1. These corrugations make it possible to tear off the material 24 being posted along this line. This is an 4 upper surface of the clamping board, whereby, when the shaft is rocked in one direction the cranks and links will raise the clamping board and when rocked in the opposite direction the links will force the clamping board downwardly and the crank pivotal connection and link pivot connection will be thrown out of alignment to form a lock to hold the clamping board in clamped position, the toes on the links limiting the rocking movement of the rod and cranks.

2. A structure as claimed in claim 1, wherein, springs are mounted in the posts on which the 'rc'd is supported and means for adjusting the important feature of my new and improved poster I equivalents may be substituted still coming within the scope of my claims. I

I claim 1. A binder comprisinga baseboard,-oppositely disposed. posts extending upwardly from said baseboard,.the posts being. formed with bifurcated formedon the rod. links'pivoted to the-cranks; and; to; the clamping board, vthe pivotal connections. betweenthe links and; clamping board being in r i l:a e m ntw thr h 1 d e t ndi iroin the; lower. ends; of. the adiacent'the Depressi-ons 29- are formed tens-ionof said springs.

3. A structure as claimed in claim 1, wherein the postsare made in sections, springs mounted in the posts to support the rod, springs mounted in the posts above the rod, and screws for adjusting the tension of the springs.

HOWARD B. BQ'YER.

I i CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

